Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F210/00—Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
  • C08F210/16—Copolymers of ethene with alpha-alkenes, e.g. EP rubbers
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
  • Y02P20/00—Technologies relating to chemical industry
  • Y02P20/50—Improvements relating to the production of bulk chemicals
  • Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts

Definitions

• the present invention is particularly suitable for the co-polymerisation of olefins in the gas phase.
• gas phase polymerisation processes can be conducted for example by introducing the gaseous monomer and comonomer into a stirred and/or gas fluidised bed comprising polyolefin and a catalyst for the polymerisation.
• the polymerisation is conducted in a fluidised bed reactor wherein a bed of polymer particles is maintained in a fluidised state by means of an ascending gas stream comprising the gaseous reaction monomer.
• the start-up of such a polymerisation generally employs a bed of polymer particles similar to the polymer which it is desired to manufacture.
• the molecular weight of the ethylene (co)polymers may be controlled in a known manner, e.g., by using hydrogen.
• molecular weight may be suitably controlled with hydrogen when the polymerisation is carried out at relatively low temperatures, e.g., from about 30°C to about 115°C. This control of molecular weight may be evidenced by a measurable positive change in melt index (I 2 ) of the polymer produced.
• I 2 melt index
• An optional component in the production of the catalyst composition of the invention is a chlorinating agent (X).
• This component can be added to the slurry before, after or with the alkoxycarbon compound.
• the chlorinated compound (X) can be chosen from a range of known chlorinating agents, including those having the formula R n SiCl 4-n , wherein each R is the same or different and is hydrogen or an alkyl group, preferably a C 1 -C 12 alkyl group, and n is an integer from 0 to 3, e.g. silicon tetrachloride.
• Alternative agents include HCl, BuCl, CCl 4 and trichloroethane.
• the fluid bed reactor is operated at pressures of up to about 1000 psi, and is preferably operated at a pressure of from about 150 to 350 psi, with operation at the higher pressures in such ranges favouring heat transfer since an increase in pressure increases the unit volume heat capacity of the gas.

Landscapes

• Chemical & Material Sciences (AREA)
• Health & Medical Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)
• Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
• Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)

Priority Applications (3)

Applications Claiming Priority (1)

Publications (1)

Family

ID=8242297

Family Applications (1)

Country Status (3)

Cited By (5)

Citations (4)

• 1999
  • 1999-12-17 EP EP99430032A patent/EP1108728A1/de not_active Withdrawn
• 2000
  • 2000-12-11 AU AU21945/01A patent/AU2194501A/en not_active Abandoned
  • 2000-12-11 WO PCT/GB2000/004742 patent/WO2001044320A1/en not_active Ceased

Patent Citations (4)

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